Use typing.TYPE_CHECKING for typehints

1 files changed, 2 insertions, 2 deletions

diff --git a/sphinx/setup_command.py b/sphinx/setup_command.py
index 1f160fec1..30553f827 100644
--- a/sphinx/setup_command.py
+++ b/sphinx/setup_command.py
@@ -17,6 +17,7 @@ import os
 import sys
 from distutils.cmd import Command
 from distutils.errors import DistutilsOptionError, DistutilsExecError  # type: ignore
+from typing import TYPE_CHECKING
 
 from six import StringIO, string_types
 
@@ -26,8 +27,7 @@ from sphinx.util.console import nocolor, color_terminal
 from sphinx.util.docutils import docutils_namespace, patch_docutils
 from sphinx.util.osutil import abspath
 
-if False:
-    # For type annotation
+if TYPE_CHECKING:
     from typing import Any, List, Tuple  # NOQA